$E518/58648: Initialize I/O
Jump from $FE6C, $FF5B:
E518: 20 A0 E5 JSR $E5A0 ; Set I/O Defaults
E51B: A9 00 LDA #$00
E51D: 8D 91 02 STA $0291 ; Flag: Upper/Lower Case change
E520: 85 CF STA $CF ; Flag: Cursor Status
E522: A9 48 LDA #$48
E524: 8D 8F 02 STA $028F ; Vector: Routine to determine Keyboard table
E527: A9 EB LDA #$EB
E529: 8D 90 02 STA $0290 ; Vector: Routine to determine Keyboard table
E52C: A9 0A LDA #$0A
E52E: 8D 89 02 STA $0289 ; Maximum number of Bytes in Keyboard Buffer
E531: 8D 8C 02 STA $028C ; Repeat Key: First repeat delay Counter
E534: A9 0E LDA #$0E
* SX64:
E534: A9 0E LDA #$06
E536: 8D 86 02 STA $0286 ; Current Character Color code
E539: A9 04 LDA #$04
E53B: 8D 8B 02 STA $028B ; Repeat Key: Speed Counter
E53E: A9 0C LDA #$0C
E540: 85 CD STA $CD ; Timer: Count down for Cursor blink toggle
E542: 85 CC STA $CC ; Flag: Cursor blink
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